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openssl/crypto/evp/p5_crpt2.c

 /* p5_crpt2.c */
 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
  * project 1999.
  */
 /* ====================================================================
- * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
+ * Copyright (c) 1999-2006 The OpenSSL Project.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer. 
  *
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
@@ skipping 47 matching lines @@
 #include <openssl/hmac.h>
 
 /* set this to print out info about the keygen algorithm */
 /* #define DEBUG_PKCS5V2 */
 
 #ifdef DEBUG_PKCS5V2
         static void h__dump (const unsigned char *p, int len);
 #endif
 
 /* This is an implementation of PKCS#5 v2.0 password based encryption key
- * derivation function PBKDF2 using the only currently defined function HMAC
- * with SHA1. Verified against test vectors posted by Peter Gutmann
+ * derivation function PBKDF2.
+ * SHA1 version verified against test vectors posted by Peter Gutmann
  * <pgut001@cs.auckland.ac.nz> to the PKCS-TNG <pkcs-tng@rsa.com> mailing list.
  */
 
-int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
+int PKCS5_PBKDF2_HMAC(const char *pass, int passlen,
                            const unsigned char *salt, int saltlen, int iter,
+                           const EVP_MD *digest,
                            int keylen, unsigned char *out)
-{
-        unsigned char digtmp[SHA_DIGEST_LENGTH], *p, itmp[4];
-        int cplen, j, k, tkeylen;
+        {
+        unsigned char digtmp[EVP_MAX_MD_SIZE], *p, itmp[4];
+        int cplen, j, k, tkeylen, mdlen;
         unsigned long i = 1;
         HMAC_CTX hctx;
 
+        mdlen = EVP_MD_size(digest);
+        if (mdlen < 0)
+                return 0;
+
         HMAC_CTX_init(&hctx);
         p = out;
         tkeylen = keylen;
-        if(!pass) passlen = 0;
-        else if(passlen == -1) passlen = strlen(pass);
-        while(tkeylen) {
-                if(tkeylen > SHA_DIGEST_LENGTH) cplen = SHA_DIGEST_LENGTH;
-                else cplen = tkeylen;
+        if(!pass)
+                passlen = 0;
+        else if(passlen == -1)
+                passlen = strlen(pass);
+        while(tkeylen)
+                {
+                if(tkeylen > mdlen)
+                        cplen = mdlen;
+                else
+                        cplen = tkeylen;
                 /* We are unlikely to ever use more than 256 blocks (5120 bits!)
                  * but just in case...
                  */
                 itmp[0] = (unsigned char)((i >> 24) & 0xff);
                 itmp[1] = (unsigned char)((i >> 16) & 0xff);
                 itmp[2] = (unsigned char)((i >> 8) & 0xff);
                 itmp[3] = (unsigned char)(i & 0xff);
-                HMAC_Init_ex(&hctx, pass, passlen, EVP_sha1(), NULL);
+                HMAC_Init_ex(&hctx, pass, passlen, digest, NULL);
                 HMAC_Update(&hctx, salt, saltlen);
                 HMAC_Update(&hctx, itmp, 4);
                 HMAC_Final(&hctx, digtmp, NULL);
                 memcpy(p, digtmp, cplen);
-                for(j = 1; j < iter; j++) {
-                        HMAC(EVP_sha1(), pass, passlen,
-                                 digtmp, SHA_DIGEST_LENGTH, digtmp, NULL);
-                        for(k = 0; k < cplen; k++) p[k] ^= digtmp[k];
-                }
+                for(j = 1; j < iter; j++)
+                        {
+                        HMAC(digest, pass, passlen,
+                                 digtmp, mdlen, digtmp, NULL);
+                        for(k = 0; k < cplen; k++)
+                                p[k] ^= digtmp[k];
+                        }
                 tkeylen-= cplen;
                 i++;
                 p+= cplen;
-        }
+                }
         HMAC_CTX_cleanup(&hctx);
 #ifdef DEBUG_PKCS5V2
         fprintf(stderr, "Password:\n");
         h__dump (pass, passlen);
         fprintf(stderr, "Salt:\n");
         h__dump (salt, saltlen);
         fprintf(stderr, "Iteration count %d\n", iter);
         fprintf(stderr, "Key:\n");
         h__dump (out, keylen);
 #endif
         return 1;
-}
+        }
+
+int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
+                           const unsigned char *salt, int saltlen, int iter,
+                           int keylen, unsigned char *out)
+        {
+        return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, EVP_sha1(),
+                                        keylen, out);
+        }
 
 #ifdef DO_TEST
 main()
 {
         unsigned char out[4];
         unsigned char salt[] = {0x12, 0x34, 0x56, 0x78};
         PKCS5_PBKDF2_HMAC_SHA1("password", -1, salt, 4, 5, 4, out);
         fprintf(stderr, "Out %02X %02X %02X %02X\n",
                                          out[0], out[1], out[2], out[3]);
 }
 
 #endif
 
 /* Now the key derivation function itself. This is a bit evil because
  * it has to check the ASN1 parameters are valid: and there are quite a
  * few of them...
  */
 
 int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
                          ASN1_TYPE *param, const EVP_CIPHER *c, const EVP_MD *md,
                          int en_de)
 {
         unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
         const unsigned char *pbuf;
         int saltlen, iter, plen;
         unsigned int keylen;
         PBE2PARAM *pbe2 = NULL;
         const EVP_CIPHER *cipher;
         PBKDF2PARAM *kdf = NULL;
+        const EVP_MD *prfmd;
+        int prf_nid, hmac_md_nid;
 
         if (param == NULL || param->type != V_ASN1_SEQUENCE ||
             param->value.sequence == NULL) {
                 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
                 return 0;
         }
 
         pbuf = param->value.sequence->data;
         plen = param->value.sequence->length;
         if(!(pbe2 = d2i_PBE2PARAM(NULL, &pbuf, plen))) {
                 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
                 return 0;
         }
 
         /* See if we recognise the key derivation function */
 
         if(OBJ_obj2nid(pbe2->keyfunc->algorithm) != NID_id_pbkdf2) {
                 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
                                 EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
                 goto err;
         }
 
         /* lets see if we recognise the encryption algorithm.
          */
 
-        cipher = EVP_get_cipherbyname(
-                        OBJ_nid2sn(OBJ_obj2nid(pbe2->encryption->algorithm)));
+        cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm);
 
         if(!cipher) {
                 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
                                                 EVP_R_UNSUPPORTED_CIPHER);
                 goto err;
         }
 
         /* Fixup cipher based on AlgorithmIdentifier */
         EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de);
         if(EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
@@ skipping 24 matching lines @@
         pbe2 = NULL;
 
         /* Now check the parameters of the kdf */
 
         if(kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)){
                 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
                                                 EVP_R_UNSUPPORTED_KEYLENGTH);
                 goto err;
         }
 
-        if(kdf->prf && (OBJ_obj2nid(kdf->prf->algorithm) != NID_hmacWithSHA1)) {
+        if (kdf->prf)
+                prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
+        else
+                prf_nid = NID_hmacWithSHA1;
+
+        if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0))
+                {
                 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
                 goto err;
-        }
+                }
+
+        prfmd = EVP_get_digestbynid(hmac_md_nid);
+        if (prfmd == NULL)
+                {
+                EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
+                goto err;
+                }
 
         if(kdf->salt->type != V_ASN1_OCTET_STRING) {
                 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
                                                 EVP_R_UNSUPPORTED_SALT_TYPE);
                 goto err;
         }
 
         /* it seems that its all OK */
         salt = kdf->salt->value.octet_string->data;
         saltlen = kdf->salt->value.octet_string->length;
         iter = ASN1_INTEGER_get(kdf->iter);
-        PKCS5_PBKDF2_HMAC_SHA1(pass, passlen, salt, saltlen, iter, keylen, key);
+        if(!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd,
+                                                   keylen, key))
+                goto err;
         EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
         OPENSSL_cleanse(key, keylen);
         PBKDF2PARAM_free(kdf);
         return 1;
 
         err:
         PBE2PARAM_free(pbe2);
         PBKDF2PARAM_free(kdf);
         return 0;
 }
 
 #ifdef DEBUG_PKCS5V2
 static void h__dump (const unsigned char *p, int len)
 {
         for (; len --; p++) fprintf(stderr, "%02X ", *p);
         fprintf(stderr, "\n");
 }
 #endif
 #endif